Table 2.

Analysis of Variance (ANOVA) between variables and NSSI.

Variables	Drinking					Smoking					Smartphone addiction
	Never	Abstinent	Little	General	Massive	Never	Abstinent	Little	General	Massive	Non-SPA	SPA	Other
M	−0.117	0.065	0.203	−0.219	0.499	0.033	0.091	0.137	0.044	0.000	−0.005	0.953	0.004
SD	0.477	1.211	1.536	0.000	1.702	0.165	0.291	0.298	0.099	0.000	1.001	2.004	0.786
F	13.177***					7.711***					3.517*
η 2	0.038					0.023					0.005

Gender was controlled as a covariate. Each level of a variable is set in order as a dummy variable from 1–5 or 1–3. M and SD are the mean and standard deviation of the different levels of the variable. The scores of non-suicidal self-injury are standardized scores. SPA referred to smartphone addiction. ^*p < 0.05, ^***p < 0.001.